I noticed this when I went back to university. I was in my late 20s and past caring about my social status on campus or looking foolish in front of my classmates. Not so much disagreeing as "surely someone else is wondering about..." So I would raise questions, including ones I might not have if I had felt more self-aware. (I rarely asked questions in grade school or my first few jobs. I didn't want to stand out.) It turns out most of my stupid questions weren't that stupid. And more than once I had other students approach me and thank me for raising the very question they were asking in their own heads. You're often not alone on that one. It's my experience that people will let you know if you're asking irrelevant/woefully-misguided questions quite quickly. They will become dismissive or impatient, etc. If you aren't getting that feedback, don't worry too much that you're annoying others.